What is the use case for this weird switch mecanism

[bearophile]

Era Scarecrow:

>  Maybe variable declaration (as long as they are default(s))? 
> Has a certain amount of sense, but makes more sense to do it 
> outside the switch case...

Declaring variables there is dangerous:

import std.stdio;
struct Foo {
     int x = 10;
}
void main() {
     int bar;
     switch(bar) {
         Foo f;
         case 10: break;
         default: writeln(f); // prints garbage
     }
}


Bye,
bearophile